Exhaust-valve-operating mechanism for explosive-engines.



W. H. & F.- M. SPAYD.

EXHAUST VALVE OPERATING MECHANISM FOR EXPLOSIVE ENGINES.

APPLICATION FILED JULY 22,1909.

Patented July 19,1910.

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W. H. & F. M. SPAYD. EXHAUST VALVE OPERATING MECHANISM FOR EXPLOSIVE ENGINES.

APPLICATION FILED JULY 22, 1909.

Patented July 19, 1910.

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WALKER H. SPAYD AND FRED 1V1. SPAYD, 0F VAN WER'I, OHIO.

EXHAUST-VALVE-OPERATING MECHANISM FOR EXPLOSIVE-ENGINES.

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To all whom it may concern:

Be it known that we, WALKER H. SPAYD and FRED M. SPAYD, citizens of the United States, residing at Van Wert, in the county of Van ort and State of Ohio, have invented certain new and useful Improvements in Exhaust-Valve-Operating Mechanism for Explosive-Engines; and we do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to valve mechanism and more especially to valve mechanisms employed in operating the exhaust of four cycle explosive engines.

The principal object of the present in vention is to improve upon and to simplify the construction of our valve mechanism shown in our Patent No. 927 ,694.

With the foregoing and other objects in view, the invention consists of certain novel features of construction, combination and arrangement of parts, as will be more fully described and particularly pointed out in the appended claims.

In the accompanying drawings: Figure 1 is a side elevation, partly in section, showing the position of the parts at the beginning of the exhaust or scavenging stroke. Fig. 2, is a similar view, showing the position of the parts during the suction stroke. F 3, is a plan View; and Figs. 1 and 5, are vertical transverse sections taken on lines let and 55, of Fig. 1.

Referring to the drawings for a more par ticular description of the invention, 1, indicates an explosive engine, and 2 the exhaust valve port leading from the exhaust valve chamber 3, to the exhaust pipe 4. The port 2, is adapted to be closed by the exhaust valve 5, provided with the usual stem 6. Secured to the cylinder of the engine, in any suitable substantial manner, is a rectangular casing 7, in which is slidably mounted the exhaust valve stem. A coil spring 10, is disposed around the exhaust valve stem 6, to hold the valve normally closed.

Slidably mounted in the outer end of the casing 7, is a longitudinal rod operating link 11, which is pivoted to the bifurcated end 12, of the cone rod 13. The outer end of the rod 13, is provided with a friction roller 1 1, which engages a cam 15, keyed to or formed on the driving shaft 16, said friction roller being held in engagement with the Specification of Letters Patent.

Application fiIed July 22, 1909.

Patented July 19, 1910.

Serial No. 509,010.

cam 15, by a coil spring 17, disposed around the rod 13. The cam 15, is provided near one end with a raised portion 16, the function of which will be presently disclosed.

In the operation of the valve mechanism, the rod operating link 11, is moved inwardly when the cam 15, is presented to the friction roller 1 1 which operation imparts a corresponding movement to the valve operating rod 8, and opens the exhaust valve 5, during the greater portion of the exhaust or scavenging stroke of the engine. As engines of the four cycle type only receive one explosion to every two revolutions of the fly wheel 6, it is, therefore, necessary that the exhaust mechanism be operated only during the stroke immediately after the power stroke and that it should not be opened during the suction or compression strokes of the engine and only during a partial portion of the scavenging stroke. In order to accomplish this, a tapering trigger 18, is pivoted, as at 19, in the casing 7, the free end of said trigger being normally held up by a spring controlled plunger 20, slidably mounted in the outer end of the casing 7, and said end of the trigger being adapted to engage at certain times of the operation of the engine, a notch 21 formed in the under edge and inner end of the rod operating link 11. By this means, as the link 11, is returned into normal position by the spring 17, and just before reaching the low end of the cam 15, the notch 21, thereof, is engaged by the free end of the trigger 18, when the free end of the link 11, is raised by the upward swinging movement of the trigger above the inner recessed end 22, of the valve operating rod 8, so that when the roller 1 1, is again engaged by the cam 15, the free end of the link 11, passes over the inner end of the rod 8, without engaging the same.

o wilLnow describe the ignition mechanism used .in connection with our invention.

A right angularly formed circuit breaker 23, carrying the lower tapering horizontally disposed arm 24;, provided. at its free end with a contact 25, is pivoted at the junction of its arms, as at 26, in the upper side of the casing 7, above the free end of the link 11. The contact 25, is adapted to engage a fixed contact 27, mounted upon the casing 7 and close the primary circuit of the spark coils S, the primary of this spark coil is included in a circuit with a suitable battery B. The

secondary of the coil has its terminals connected with the spark plug P. spring projected operating rod 28, has its lnner end connected with the vertical arm 29, of the circuit breaker 23, and is provided at its outer end with the friction roller 30. The roller 30, is adapted to be engaged by the outer edge 31, of a pivoted block 32, which fits in the hub '33, of the fly wheel 34. The free end of the block 32, is connected by the link 35, with the arm 36, pivoted to the fly wheel and carrying the weight 37, at its free end. The tendency of the free end to move outwardly owing to the centrifugal force when the engine is in operation may be retracted by the spring 33, as will be understood. The block 32, is pivoted in the hub directly opposite the raised portion 16, of the cam 15, the purpose of which will presently appear. WVhen the speed of the engine is up and during the compression stroke or that time in the operation of the engine when the free end of the link 11, passes over the inner end of the valve operating rod 8, without engaging the same, the roller 30, of the link 28, is also engaged by the outer edge of the block 32, which moves said rod inwardly against the action of its spring 39, and causes the portion 24, of the circuit breaker 23, to move down and break the circuit. The upper edge of the free end of the link 11, is recessed longitudinally as at 40, to receive the free end of the hori: zontal portion 24, of the circuit breaker 23, when swung down. It is to be particularly observed that the high portion of the cam 15, projects a little beyond the free end of the pivoted block 32, so that after the block 32, is disengaged from the friction roller 30, the head 41, formed at the inner end of the link 11, will be slightly beyond the free end of the horizontal portion 2 1, of the circuit breaker 23, in order that the lower portion 2a, of the circuit breaker may be permitted to swing up into its former position and close the circuit. The link 11, is then free to be turned into its former position by the spring 17, and when next engaged by the cam 15, again moves the valve operating rod inwardly to open the exhaust valve.

From the foregoing description taken in connection with the accompanying drawings, the construction and operation of the invention will be readily understood without requiring a more extended explanation.

Various changes in the form, proportion and the minor details of construction may be resorted to without departing from the principle or sacrificing any of the advantages of the invention, as defined in the appended claims.

Having thus described our invention, what we claim is:

1. An exhaust valve operating mechanism for explosive engines comprising a slidably mounted valve operating member, a slidably mounted spring retracted pivoted link to operate said member, a cam on the drive shaft to operate said link, a trigger pivoted beneath the valve operating member to cause the free end of the link to ride over the adjacent end of the valve operating member without engaging the same at every other revolution of the drive shaft, and an ignition arrangement controlled by the operation of the engine.

2. An exhaust valve operating mechanism for explosive engines comprising a slidably mounted valve operating member provided with a recessed upper edge, a pivoted slidably mounted link for moving said valve operating member in one direction, a cam on the drive shaft to move the link in one direction, a spring to move said link in the opposite direction, a trigger beneath the valve operating member to cause the free end of the link to pass over the recessed end of the valve operating member without operating the same at every other revolution of the drive shaft and means controlled in the operation of the engine to make and break the circuit through the igniter at each revolution "of the drive shaft.

3. An exhaust valve operating mechanism for explosive engines comprising a slidably mounted valve operating rod, a pivoted slidably mounted link to operate said member, a cam on the drive shaft to move said link in one direction, pivoted means to cause the free end of the link to pass or ride over the adjacent end of the valve operating member without engaging the same at every other revolution of the drive shaft, means for making and breaking the circuit through the igniter at every revolution of the drive shaft, said means comprising a pivoted circuit breaker, a spring controlled rod connected therewith, and a pivoted block in the hub of the fly wheel to engage the outer end of said link and to move the same inwardly to swing the circuit breaker in position to break the circuit at each revolution of the drive shaft and fly wheel.

a. An exhaust valve operating mechanism for explosive engines comprising a valve operating rod, a pivoted link to operate said rod, means to cause the free end of said link to pass over the valve operating rod without operating the same at every other revolution of the drive shaft, an ignition mechanism controlled by the operation of the engine and comprising a pivoted circuit breaker, a spring retracted rod connected therewith, and a pivoted block carried by the fly-wheel to engage the outer end of said operating rod and operate the same in one direction against the action of its spring at each revolution of the fly-wheel.

5. An exhaust valve operating mechanism for explosive engines comprising a slidably mounted valve operating rod provided with a recessed upper edge, a pivoted spring retracted link to operate said rod, a cam having a raised portion on the drive shaft to operate said link in one direction, pivoted means to cause the free end of the link to pass over the free end of the valve operating rod without engaging the same at every other revolution of the drive shaft, an ignition mechanism controlled by the operation of the engine and comprising a pivoted right angularly formed circuit breaker, a spring retracted operating rod connected with the vertical arm of said circuit breaker and a pivoted block carried by the fiy-Wheel and located directly opposite the raised portion of the cam on the drive shaft to engage and operate the operating rod of the circuit breaker at every revolution of the drive shaft, one edge of the raised portion of the cam extending beyond the free end of the block whereby the recessed end of the operating link is momentarily held beyond the horizontal arm of the circuit breaker when the latter is in circuit breaking position or in engagement with the recessed upper edge of the operating link.

In testimony whereof we have hereunto set our hands in presence of two subscribing witnesses.

l Vitnesses EDWARD 0. Sum, G. L.'l/VERT. 

